| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil equalizing method capable of preventing inflow of refrigerant gas to oil equalizing pipes and of appropriately returning oil amount of compressors. SOLUTION: A refrigerant circuit Ka is provided with first to third compressors 11 to 13, the oil equalizing pipes 16 supplying oil to the first to third compressors 11 to 13 and connected to each other via an oil equalizing pipe assembling point P3, and a suction pipe 14 connected to the first to third compressor 11 to 13 and supplying refrigerant gas to the first to third compressors 11 to 13. In the refrigerant circuit Ka, oil equalization of each shell 11a, 12a, 13a of the first to third compressors 11 to 13 is performed. In this oil equalizing method, the pressure during operation inside the shells of the compressors other than the shell of the compressor performing oil equalization is made equal to the pressure at the oil equalizing pipe assembling point P3. COPYRIGHT: (C)2005,JPO&NCIPI
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